Technically, the GBC model obtains a collapse of the state vector by enriching the standard
Schrödinger dynamics with the addition of a point \(P\)  in configuration space; the
components of \(P\)  are all Bohmian positions of the particles contained in
the physical system.  The role of \(P\)  is somewhat similar to that of the wave singularity in the de Broglie theory of the double solution [1]}.  The position of \(P\)  is guided by the wave function, but conversely \(P\)  reacts on it (as opposed to what happens in usual dBB theory). One can then expect that this point should play the role of an attractor and, if the
number of particles is sufficient, that a collective effect might occur that forces
the \(N\)  body wave function to remain in the vicinity of \(P\) . We will see that, during a
measurement process, this creates the equivalent of the von Neumann
projection postulate, with a very sudden projection obtained within a
continuous dynamics.
